Control system for a transportation system

摘要

A solid state static converter is connected to receive a three-phase A.C. input and directly supply a direct current output to a D.C. motor which operates a traction sheave to control the movement of an elevator car. The magnitude and direction of the direct current output from the static converter is controlled by an error signal derived by the summation of a speed signal obtained from a tachometer coupled to the motor drive shaft and a vehicle speed command signal provided by a pattern generator and having maximum velocity, acceleration and rate of change of acceleration limitations for safe and smooth control of the elevator car and for accurate stopping at landings.